Demodulation and despreading from frequency samples

Shunichiro Egami; Katsumi Sugiyama

Demodulation and despreading from frequency samples

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.

Original language	English
Title of host publication	21st International Communications Satellite Systems Conference and Exhibit
Publication status	Published - 2003 Dec 1
Externally published	Yes
Event	21st International Communications Satellite Systems Conference and Exhibit, ICSSC 2003 - Yokohama, Japan Duration: 2003 Apr 15 → 2003 Apr 19

Publication series

Name	21st International Communications Satellite Systems Conference and Exhibit

Other

Other	21st International Communications Satellite Systems Conference and Exhibit, ICSSC 2003
Country	Japan
City	Yokohama
Period	03/4/15 → 03/4/19

ASJC Scopus subject areas

Computer Networks and Communications
Signal Processing
Atmospheric Science
Electrical and Electronic Engineering
Media Technology

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title = "Demodulation and despreading from frequency samples",

abstract = "By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.",

author = "Shunichiro Egami and Katsumi Sugiyama",

year = "2003",

month = dec,

day = "1",

language = "English",

isbn = "9781624100932",

series = "21st International Communications Satellite Systems Conference and Exhibit",

booktitle = "21st International Communications Satellite Systems Conference and Exhibit",

note = "21st International Communications Satellite Systems Conference and Exhibit, ICSSC 2003 ; Conference date: 15-04-2003 Through 19-04-2003",

}

TY - GEN

T1 - Demodulation and despreading from frequency samples

AU - Egami, Shunichiro

AU - Sugiyama, Katsumi

PY - 2003/12/1

Y1 - 2003/12/1

N2 - By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.

AB - By the advent of the fast DSP, now, it is possible to change whole over 100MHz bandwidth to frequency samples. This paper propose methods of PSK demodulation and CDMA despreading both starting from frequency samples. PSK signal frequency samples are selected from the whole frequency samples which covers total beam bandwidth. After selecting frequency samples, samples are decimated to appropriate lower rate. Then, frequency samples are transformed to time samples by IFFT. Time samples are squared and transformed again to frequency samples. The first and the second peaks are used to recover carrier information. In case of CDMA, frequency domain correlation method is applied. The code for despreading is transformed to frequency samples by FFT. Then fast correlation method is applied to despreading or despreading synchronization.

UR - http://www.scopus.com/inward/record.url?scp=84897699323&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897699323&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84897699323

SN - 9781624100932

T3 - 21st International Communications Satellite Systems Conference and Exhibit

BT - 21st International Communications Satellite Systems Conference and Exhibit

T2 - 21st International Communications Satellite Systems Conference and Exhibit, ICSSC 2003

Y2 - 15 April 2003 through 19 April 2003

ER -